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Per Wikipedia, copy editing is is the process of reviewing and correcting written material to improve accuracy, readability, and fitness for its purpose, and to ensure that it is free of error, omission, inconsistency, and repetition.

This means that what you'll be doing is making sure that the content is accurate, isn't missing anything major, and free of spelling or grammatical errors. You should also check the sourcing to make sure that it's a reliable source and that it backs up the claims in the article.